MFX Specifications


MFX Scientific Capabilities

Scientific Applications Femtosecond Crystallography
Time-resolved scattering with hard X-rays
Techniques and Scattering Geometry Macromolecular Crystallography
Forward scattering on fixed-mounted samples, 
and in liquid jets
Small Angle X-ray Scattering
Wide Angle X-ray Scattering
X-ray Emission Spectroscopy

Source Parameters

Photon Energy 5-11 keV for the 1st harmonic*
Up to 25  keV for 2nd and 3rd harmonic
Source Size 60 x 60 µm(HxV) FWHM @ 8.3 keV
78 x 78 µm2 (HxV) FWHM @ 2 keV
Source Divergence 2 x 2 µrad2 (HxV) FWHM @ 8.3 keV
~7 x 7 µrad2 (HxV) FWHM @ 2 keV
Repetition Rate 120 , 60, 30, 10 Hz, Single shot mode
Pulse Duration 30-100 fs (high charge mode)
<10 fs (low charge mode)
Pulse Energy 1-4 mJ  (high charge mode)
~ 0.2 mJ  (low charge mode)
Photons per Pulse ~1 x 1012 (high charge mode @ 8.3 keV)
~1 x 1011 (low charge mode @ 8.3 keV)

* Energies below 5 keV are in principle usable but the beam size at the end station is large leading to poor focusing performance and reduced flux. Also, transmission of the beam into atmospheric pressure leads to significant losses. LCLS-II will extend the energy range up to 20 keV.

Photon Beam Properties

Focusing Capability Beryllium Lenses in Hutch 4.5 (~1 µm focus)
Beam Size at Sample (8 keV) (Calculated for perfect optics) 0.7 x 0.7 µm2 FWHM
Beam Divergence (Calculated for perfect optics) ~0.3 x 0.3 mrad2 FWHM
Energy Range 5-11 keV (1st harmonic using LCLS-I)
5-20 keV (1st harmonic using LCLS-II)
11-25  keV (2nd and 3rd harmonic using LCLS-I)
20-25  keV (2nd and 3rd harmonic using LCLS-II)
Energy Resolution ΔE/E ~0.2% (bandwidth of the LCLS beam)
No monochromator currently

Sample Environment and Detector

Sample Environment Atmospheric pressure
Fixed sample on grids at room temperature
Fixed sample on grids at cryogenic temperature
Helium atmosphere
Humidity control
Sample Injectors Liquid Jets of various kinds
Detectors TBD